近年来我区化肥用量增多,产量大幅度上升,但粮食产量落后于化肥用量的增长速度,反映了化肥的效益下降。如何科学地施用化肥,充分发挥化肥的经济效益,就成为十分重要和亟待解决的课题。1981～84年我们在全区范围内开展了小麦氮磷配合试验,探讨不同土壤和土地生产力氮、磷化肥适宜用量和比例,以期找出我区主要土类最高、最佳氮磷肥用量,为合理施肥提供科学依据。现就四年结果汇总如下。一、试验条件及方法(一)试验条件 1981～84年在全区山川各县、市、场、站共设21个点,89个试验。试验地土壤大部为灌淤土,兼顾黑垆 In recent years, there has been an increase in the amount of fertilizer used in our district, and the output has risen sharply. However, the output of grain lags behind that of chemical fertilizers, reflecting the declining efficiency of chemical fertilizers. How to use chemical fertilizers scientifically and give full play to the economic benefits of chemical fertilizers has become a very important and urgent issue to be solved. From 1981 to 1984, we carried out the experiments of nitrogen and phosphorus in wheat in the whole area to discuss the appropriate amount and proportion of nitrogen and phosphorus fertilizers in different soil and land productivity in order to find out the highest and the best nitrogen and phosphorus fertilizers in the main soil types in our district, which are Reasonable fertilization provide a scientific basis. The four-year results are summarized below. First, the test conditions and methods (A) test conditions 1981 to 84 in all counties, cities, markets, stations a total of 21 points, 89 trials. Most of the soil tested is irrigated silt, taking into account black mound